New phase II with Visit 2 and Visit 3 using STIS instrument. ----- Attempting Submission 1 (Thu Jul 03 19:21:52 GMT 2008) ----- ----- Attempting Submission 2 (Mon Nov 23 14:14:34 GMT 2009) ----- Assigned ID: 776 ----- Attempting Submission 1 (Fri Mar 07 23:38:53 GMT 2008) ----- Dynamics in the atmosphere of the evaporating planet HD189733b With HST/STIS, we detected and characterized the upper atmosphere of the extrasolar planet HD209458b, showing that the planet must be evaporating at a rate of ~10^10 g/s in a "blow-off" mechanism. More recently, using ACS we concluded that HD189733b is also evaporating. However, because of the low resolution of the ACS prism spectroscopy, the escape rate and mechanism are still to be determined. This is one of the prime objectives of the present proposal. COS observations of the absorption line profile with 15 km/s resolution will allow us to probe the dynamics of the escaping gas, and therefore to determine the escape rate. Simultaneous observations of the transit depth and spectral shape in several important lines (not only HI, but also OI, CII and possibly NI) will constrain the escape mechanism and allow us to distinguish between several scenarios. The results will enlighten the physical phenomenons at work in the exosphere of these extrasolar planets, and provide new constraints for the modeling of the evaporation of hot-Jupiters. Note: After execution of the first orbit with COS. A Change Request has been accepted to the STIS instrument to secure the scientific return of the Lyman-alpha observations.
We plan to observe 3 transits of HD189733b, using 3 visits of 4 HST orbits each. In visit #1, COS was used to obtain 3 exposures with the G130M and in time-tag mode. For visits #2 and #3, STIS will be used with the G140M and in time-tag mode. For each HST visit for STIS observation, we will first execute an ACQ at the beginning of the first orbit with the F28X50OII aperture. With an exposure time of 2s (per search point) the S/N ratio is about 160. For each orbit we request an ACQ/PEAK with G430L, the 52x0.05 slit and exposure time of 1s providing a total count of about 5e6. To observe the planetary transit, the time constraint is given by a phase requirement calculated to allow 2 full HST orbits observation to be executed before and one full HST orbit after the planetary transit. The first exposure of the first orbit must be taken at a phase in the range 0.927 - 0.934 This program should be scheduled for observations with the lowest airglow possible. The keyword SHADOW has not been selected so that the observations are schedulable, but these observations should be scheduled close to SHADOW if possible. (Selection of SHADOW keyword results in strange results from the 'orbit planner', and almost zero visibility from the 'visit planner'). EXTRA-SOLAR PLANETS 12 false 0.0 0.0 false false false false false false SUPPORTED STAR K V-IV This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 20 00 43.7133 +22 42 39.07 J2000 COS/FUV Spectroscopic No No G130M 1291 Phase windows are not calculated when the period is less than 7.0 days. Assuming no scheduling restrictions for Phase 0.962/0.976. The scheduling data was generated by CASM 17.5. CASM was run in Phase II mode. C:\Documents and Settings\Alain Lecavelier\Local Settings\Temp\OPVisit20945.xml This program should be scheduled for observations with the lowest airglow possible. The keyword SHADOW has not been selected so that the observations are schedulable, but these observations should be scheduled close to SHADOW if possible. (Selection of SHADOW keyword results in strange results from the 'orbit planner', and almost zero visibility from the 'visit planner'). 1253124819000 108.06239139555191 (Tic-Visit :proposal-id 11673 :visit-id "01" :proposal-version -1 :trans-version "20090915" :date "23-Nov-2009 15:12:40.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 687360 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11673 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 11673 :visit-id "01" :obset-id "A1" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11673 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2925 :al-overhead-at-end 0 :internal-dur-at-end 409 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11673 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3036 :al-overhead-at-end 0 :internal-dur-at-end 97 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11673 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3036 :al-overhead-at-end 0 :internal-dur-at-end 97 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11673 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3036 :al-overhead-at-end 0 :internal-dur-at-end 409 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) true 4 0 Exposure time to reach S/N of 100 Exposure time of 2s for S/N of 100 on Stripe B Exposure time of 2s for S/N of 100 Phase windows are not calculated when the period is less than 7.0 days. Assuming no scheduling restrictions for Phase 0.927/0.934. The scheduling data was generated by CASM 17.5. CASM was run in Phase II mode. C:\Documents and Settings\Alain Lecavelier\Local Settings\Temp\OPVisit20941.xml (Tic-Visit :proposal-id 11673 :visit-id "02" :proposal-version -1 :trans-version "20090915" :date "23-Nov-2009 15:06:20.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 628832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11673 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11673 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2925 :al-overhead-at-end 0 :internal-dur-at-end 180 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11673 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3036 :al-overhead-at-end 0 :internal-dur-at-end 180 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11673 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3036 :al-overhead-at-end 0 :internal-dur-at-end 180 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11673 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3036 :al-overhead-at-end 0 :internal-dur-at-end 442 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) true 4 0 SNR = 163.00, Brightest (binned) pixel = 15400 e- (ETC 18.0.2). Total count = 5e6 in 1 sec (Gain=4, CR Split=1), exposure time well below saturation at ~40 s. For the Buffer time, we assumed a total rate conservative upper limit of about 250 count/s (K0 star V=7.5+ high airglow + Ly-alpha line of 5e-13 erg/s/cm2), providing a maximum buffer-time of 8000s. 2000 s buffer-time will secure the accum of all scientific photons (p228 and Fig. 11.6 p229 of STIS Handbook). Total count = 5e6 in 1 sec (Gain=4, CR Split=1), exposure time well below saturation at ~40 s. Total count = 5e6 in 1 sec (Gain=4, CR Split=1), exposure time well below saturation at ~40 s. Total count = 5e6 in 1 sec (Gain=4, CR Split=1), exposure time well below saturation at ~40 s. Phase windows are not calculated when the period is less than 7.0 days. Assuming no scheduling restrictions for Phase 0.927/0.934. The scheduling data was generated by CASM 17.5. CASM was run in Phase II mode. C:\Documents and Settings\Alain Lecavelier\Local Settings\Temp\OPVisit20942.xml (Tic-Visit :proposal-id 11673 :visit-id "03" :proposal-version -1 :trans-version "20090915" :date "23-Nov-2009 15:06:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 628832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11673 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11673 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2925 :al-overhead-at-end 0 :internal-dur-at-end 180 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11673 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3036 :al-overhead-at-end 0 :internal-dur-at-end 180 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11673 :visit-id "03" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3036 :al-overhead-at-end 0 :internal-dur-at-end 180 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11673 :visit-id "03" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3036 :al-overhead-at-end 0 :internal-dur-at-end 442 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3258 :pcs-gap 0 ) true 4 0 SNR = 163.00, Brightest (binned) pixel = 15400 e- (ETC 18.0.2). Total count = 5e6 in 1 sec (Gain=4, CR Split=1), exposure time well below saturation at ~40 s. For the Buffer time, we assumed a total rate conservative upper limit of about 250 count/s (K0 star V=7.5+ high airglow + Ly-alpha line of 5e-13 erg/s/cm2), providing a maximum buffer-time of 8000s. 2000 s buffer-time will secure the accum of all scientific photons (p228 and Fig. 11.6 p229 of STIS Handbook). Total count = 5e6 in 1 sec (Gain=4, CR Split=1), exposure time well below saturation at ~40 s. Total count = 5e6 in 1 sec (Gain=4, CR Split=1), exposure time well below saturation at ~40 s. Total count = 5e6 in 1 sec (Gain=4, CR Split=1), exposure time well below saturation at ~40 s.